sonic@TGHE:~$ sudo aptitude install libavcodec-extra-53
[sudo] password for sonic: 
The following NEW packages will be installed:
  libavcodec-extra-53{b} libavutil-extra-51{ab} 
0 packages upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/2,743 kB of archives. After unpacking 6,521 kB will be used.
The following packages have unmet dependencies:
  libavutil-extra-51: Conflicts: libavutil51 but 4:0.7.1-1ubuntu1 is installed.
  libavcodec-extra-53: Conflicts: libavcodec53 but 4:0.7.1-1ubuntu1 is installed.
The following actions will resolve these dependencies:

      Remove the following packages:
1)      audacity                    
2)      ffmpeg                      
3)      libavcodec53                
4)      libavdevice53               
5)      libavfilter2                
6)      libavformat53               
7)      libavutil51                 
8)      libpostproc52               
9)      libswscale2                 
10)     vlc                         
11)     vlc-nox                     
12)     vlc-plugin-pulse            
13)     winff                       



Accept this solution? [Y/n/q/?] n
The following actions will resolve these dependencies:

      Remove the following packages:                          
1)      ffmpeg                                                
2)      libavcodec53                                          
3)      libavdevice53                                         
4)      libavfilter2                                          
5)      libavformat53                                         
6)      libavutil51                                           
7)      libpostproc52                                         
8)      libswscale2                                           
9)      winff                                                                                           
                                                                                                        
      Install the following packages:                                                                   
10)     libavformat-extra-53 [4:0.7.1.0ubuntu1 (now, oneiric)]                                          
11)     libpostproc-extra-52 [4:0.7.1.0ubuntu1 (now, oneiric)]                                          
12)     libswscale-extra-2 [4:0.7.1.0ubuntu1 (now, oneiric)]                                            
                                                                                                        


Accept this solution? [Y/n/q/?] n
The following actions will resolve these dependencies:

      Remove the following packages:                          
1)      ffmpeg                                                
2)      libavcodec53                                          
3)      libavdevice53                                         
4)      libavfilter2                                          
5)      libavformat53                                         
6)      libavutil51                                           
7)      libpostproc52                                         
8)      libswscale2                                           
9)      vlc                                                   
10)     vlc-nox                                               
11)     vlc-plugin-pulse                                      
12)     winff                                                 

      Install the following packages:                         
13)     libavformat-extra-53 [4:0.7.1.0ubuntu1 (now, oneiric)]



Accept this solution? [Y/n/q/?] n
The following actions will resolve these dependencies:

     Keep the following packages at their current version:
1)     libavcodec-extra-53 [Not Installed]                
2)     libavutil-extra-51 [Not Installed]                 



Accept this solution? [Y/n/q/?] q
Abandoning all efforts to resolve these dependencies.
Abort.